ATMEGA3208 datasheet(10/68 Pages) MICROCHIP

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Table 5-3. Operating Voltage and Frequency

Symbol

Description

Condition

Min. Max.(1)

Unit

fCLK_CPU Nominal operating system clock frequency

VDD=[1.8, 5.5]V

TA=[-40, 105]°C(2)

MHz

VDD=[2.7, 5.5]V

TA=[-40, 105]°C(3)

VDD=[4.5, 5.5]V

TA=[-40, 105]°C(4)

VDD=[2.7, 5.5]V

TA=[-40, 125]°C(3)

VDD=[4.5, 5.5]V

TA=[-40, 125]°C(3)

Note:

Operation is guaranteed 5% above the maximum frequency.

Operation is guaranteed down to BOD triggering level, VBOD with BODLEVEL=1.8V.

Operation is guaranteed down to BOD triggering level, VBOD with BODLEVEL=2.7V.

Operation is guaranteed down to BOD triggering level, VBOD with BODLEVEL=4.3V.

The maximum CPU clock frequency depends on VDD. As shown in the following figure, the Maximum

Frequency vs. VDD is linear between 1.8V < VDD < 2.7V and 2.7V < VDD < 4.5V

Figure 5-1. Maximum Frequency vs. VDD for [-40, 105]°C

5MHz

10MHz

20MHz

1.8V

5.5V

2.7V

4.5V

Safe Operating Area

5.3

Power Considerations

The average die junction temperature, TJ (in °C) is given from the formula

TJ = TA+PD * RθJA

ATmega3208/4808 – 32-pin Data Sheet

Electrical Characteristics

Datasheet Preliminary

DS40002017A-page 10

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